#! /bin/sh
### BEGIN INIT INFO
# Provides:          zuul-scheduler
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Zuul scheduler
# Description:       Trunk gating system
### END INIT INFO

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="Zuul"
NAME=zuul-scheduler
DAEMON=/usr/local/bin/zuul-scheduler
PIDFILE=/var/run/$NAME/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
USER=zuul

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

PIDFILE_DIR=$(dirname $PIDFILE)

#
# Function that starts the daemon/service
#
do_start()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    #   3 if pid file exits already

    if [ ! -d "$PIDFILE_DIR" ] ; then
        mkdir -p $PIDFILE_DIR
        chown $USER $PIDFILE_DIR
    fi
    ulimit -n 8192
    if [ -f $PIDFILE ]; then
        return 3
    fi
    start-stop-daemon \
        --start --quiet --pidfile $PIDFILE -c $USER \
        --exec $DAEMON --test > /dev/null || return 1
    start-stop-daemon \
        --start --quiet --pidfile $PIDFILE -c $USER \
        --exec $DAEMON -- $DAEMON_ARGS || return 2
    # Add code here, if necessary, that waits for the process to be ready
    # to handle requests from services started subsequently which depend
    # on this one.  As a last resort, sleep for some time.
}

#
# Function that stops the daemon/service
#
do_stop()
{
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    start-stop-daemon --stop --signal 9 --pidfile $PIDFILE
    RETVAL="$?"
    [ "$RETVAL" = 2 ] && return 2
    if [ -f "$PIDFILE" ] ; then
        rm -f $PIDFILE
    fi
    return "$RETVAL"
}

#
# Function that stops the daemon/service
#
do_graceful_stop()
{
    PID=`cat $PIDFILE`
    kill -USR1 $PID

    # wait until really stopped
    if [ -n "${PID:-}" ]; then
        i=0
        while kill -0 "${PID:-}" 2> /dev/null;  do
            if [ $i -eq '0' ]; then
                echo -n " ... waiting "
            else
                echo -n "."
            fi
            i=$(($i+1))
            sleep 1
        done
    fi

    rm -f /var/run/$NAME/*
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
    #
    # If the daemon can reload its configuration without
    # restarting (for example, when it is sent a SIGHUP),
    # then implement that here.
    #
    start-stop-daemon \
        --stop --signal 1 --quiet --pidfile $PIDFILE --name zuul-scheduler
    return 0
}

case "$1" in
    start)
        [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
        do_start
        case "$?" in
            0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
            2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
            3) echo "Pidfile at $PIDFILE already exists, run service zuul-scheduler stop to clean up." ;;
        esac
        ;;
    stop)
        [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
        do_stop
        case "$?" in
            0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
            2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
    status)
        status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
        ;;
    reload|force-reload)
        #
        # If do_reload() is not implemented then leave this commented out
        # and leave 'force-reload' as an alias for 'restart'.
        #
        log_daemon_msg "Reloading $DESC" "$NAME"
        do_reload
        log_end_msg $?
        ;;
    restart)
        #
        # If the "reload" option is implemented then remove the
        # 'force-reload' alias
        #
        log_daemon_msg "Restarting $DESC" "$NAME"
        do_graceful_stop
        do_start
        ;;
    *)
        #echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
        echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
        exit 3
        ;;
esac

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